//
//  TextView.m
//  TextDidChange
//
//  Created by Timothy J. Wood on 10/27/09.
//  Copyright 2009 The Omni Group. All rights reserved.
//


/*

 A button hooked up to -insertFoo: yields:
 2009-10-27 13:18:58.784 TextDidChange[1801:a0b] insert range:{0, 0}
 2009-10-27 13:18:58.786 TextDidChange[1801:a0b] in processEditing editedMask:2 editedRange:{0, 3} changeInLength:3
 2009-10-27 13:18:58.787 TextDidChange[1801:a0b] rangeForUserTextChange = {3, 0}
 2009-10-27 13:18:58.787 TextDidChange[1801:a0b] textStorage.editedRange = {9223372036854775807, 3}

 copying & pasting that "foo" right after yields:
 2009-10-27 13:19:02.425 TextDidChange[1801:a0b] in processEditing editedMask:3 editedRange:{3, 3} changeInLength:3
 2009-10-27 13:19:02.426 TextDidChange[1801:a0b] rangeForUserTextChange = {6, 0}
 2009-10-27 13:19:02.427 TextDidChange[1801:a0b] textStorage.editedRange = {9223372036854775807, 3}

 then, selecting and deleting the first foo:
 2009-10-27 13:19:48.929 TextDidChange[1801:a0b] in processEditing editedMask:2 editedRange:{0, 0} changeInLength:-3
 2009-10-27 13:19:48.930 TextDidChange[1801:a0b] rangeForUserTextChange = {0, 0}
 2009-10-27 13:19:48.930 TextDidChange[1801:a0b] textStorage.editedRange = {9223372036854775807, 0}

 */
#import "TextView.h"

@interface TextStorage : NSTextStorage
{
    NSMutableAttributedString *_contents;
}
@end
@implementation TextStorage

// NSTextStorage is abstract; minimal concrete subclass
- init;
{
    if (!(self = [super init]))
        return nil;
    _contents  = [[NSMutableAttributedString alloc] initWithString:@"" attributes:nil];
    return self;
}

- (void)dealloc;
{
    [_contents release];
    [super dealloc];
}

#pragma mark -
#pragma NSAttributedString subclass

- (NSUInteger)length;
{
    return [_contents length];
}

- (NSString *)string;
{
    return [_contents string];
}

- (NSDictionary *)attributesAtIndex:(NSUInteger)location effectiveRange:(NSRangePointer)range;
{
    return [_contents attributesAtIndex:location effectiveRange:range];
}

#pragma mark -
#pragma NSMutableAttributedString subclass

- (void)beginEditing;
{
    [super beginEditing];
    [_contents beginEditing];
}

- (void)endEditing;
{
    [_contents endEditing];
    [super endEditing];
}

- (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)str;
{
    [_contents replaceCharactersInRange:range withString:str];
    [self edited:NSTextStorageEditedCharacters range:range changeInLength:[str length] - range.length];
}

- (void)replaceCharactersInRange:(NSRange)range withAttributedString:(NSAttributedString *)attributedString;
{
    [_contents replaceCharactersInRange:range withAttributedString:attributedString];
    [self edited:NSTextStorageEditedAttributes|NSTextStorageEditedCharacters range:range changeInLength:[attributedString length] - range.length];
}

- (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range;
{
    [_contents setAttributes:attrs range:range];
    [self edited:NSTextStorageEditedAttributes range:range changeInLength:0];
}

#pragma mark -
#pragma mark NSTextStorage subclass

- (void)processEditing;
{
    NSLog(@"in processEditing editedMask:%ld editedRange:%@ changeInLength:%ld", [self editedMask], NSStringFromRange([self editedRange]), [self changeInLength]);
    [super processEditing];
}

@end

@implementation TextView

- (void)awakeFromNib;
{
    // Terrible
    TextStorage *textStorage = [[TextStorage alloc] init];
    [[self layoutManager] replaceTextStorage:textStorage];
    [textStorage release];
}

- (void)didChangeText;
{
    NSLog(@"rangeForUserTextChange = %@", NSStringFromRange([self rangeForUserTextChange]));
    NSLog(@"textStorage.editedRange = %@", NSStringFromRange([self.textStorage editedRange]));

    [super didChangeText];
}

- (IBAction)insertFoo:(id)sender;
{
    // ... not bothering with multi-range for test ...
    NSRange range = [self selectionRangeForProposedRange:[self selectedRange] granularity:[self selectionGranularity]];
    NSLog(@"insert range:%@", NSStringFromRange(range));

    if ([self shouldChangeTextInRange:range replacementString:@"foo"]) {
        NSTextStorage *textStorage = [self textStorage];
        [textStorage beginEditing];
        [textStorage replaceCharactersInRange:range withString:@"foo"];
        [textStorage endEditing];
        [self didChangeText];
    }
}

@end